linux-kernel - [PATCH v5 1/2] watchdog: Handle comma separated nmi

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Date: Mon, 29 Apr 2024 23:02:35 -0700
From: Song Liu <song@...nel.org>
To: linux-kernel@...r.kernel.org
Cc: kernel-team@...a.com,
	Song Liu <song@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Peter Zijlstra <peterz@...radead.org>
Subject: [PATCH v5 1/2] watchdog: Handle comma separated nmi_watchdog command line

Per the document, the kernel can accept comma separated command line like
nmi_watchdog=nopanic,0. However, the code doesn't really handle it. Fix
the kernel to handle it properly.

Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Signed-off-by: Song Liu <song@...nel.org>
---
 kernel/watchdog.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/kernel/watchdog.c b/kernel/watchdog.c
index d7b2125503af..7f54484de16f 100644
--- a/kernel/watchdog.c
+++ b/kernel/watchdog.c
@@ -71,6 +71,7 @@ void __init hardlockup_detector_disable(void)
 
 static int __init hardlockup_panic_setup(char *str)
 {
+next:
 	if (!strncmp(str, "panic", 5))
 		hardlockup_panic = 1;
 	else if (!strncmp(str, "nopanic", 7))
@@ -79,6 +80,12 @@ static int __init hardlockup_panic_setup(char *str)
 		watchdog_hardlockup_user_enabled = 0;
 	else if (!strncmp(str, "1", 1))
 		watchdog_hardlockup_user_enabled = 1;
+	while (*(str++)) {
+		if (*str == ',') {
+			str++;
+			goto next;
+		}
+	}
 	return 1;
 }
 __setup("nmi_watchdog=", hardlockup_panic_setup);
-- 
2.43.0